Dry cell



May 22, 1928.

J. J. M CANN ET AL DRY CELL Filed Aug. 26, 1924 4 TTWMEY Patented May 22, 1928.

UNITED STATES PATENT OFFICE.

JAMES J. Km, 0] KEABNY, NEW JERSEY, AND

BY MESNE ASSIGNMENTS, T0 NATIONAL CARBON N. Y., A CORPORATION OF NEW YORK.

gu tar, imw YORK, assmnons, column, me, or NEW YORK,

crmnnas e. nmnsALL, or

DRY CELL.

ncense flied August 26, 1924. Serial No. 134,242.

This invention relates to new and useful im rovements in liners for dry cells.

t is the object of the present invention to produce a liner adapted to separate the depolarizing mix from the zinc electrode,

and one which may be produced by automatic machinery ready for use in the assembling of dry cells.

With this object in view, the liner consists of paper or other cellulose absorbent medium which is wound into a hollow tube of the desired size and shape. The tube thus produced is cut into the required lengths ready for insertion into a dry cell.

The invention will he more completely understood from the following description of an embodiment thereof and the appended claims. While disclosed in connection with a tamped cell, the liner forming the object of the present invention is applicable also to other types of dry cells, e. g., in which the depolarizing unit is in the form of a bobbin, compacted tablets, or washers, etc.

In the drawings, Fig. 1 is a perspective view of a paper liner wound into a tube, and Figi 2 is a vertical cross-section of an assci'nbled battery. I

1 is a ribbon of paper or other absorbent medium that may be used as a liner or bag for dry cells. The paper ribbon is wound in spirals by suitable machinery into a tube 2 of the desired diameter with adjacent edges overlapping as indicated at 3. Preferably, the edges 3 are fastened together by a starch or flour paste. The tube 2 is cut into suitable lengths to serve as a. separator be: tween zinc electrode 4 and the depolarizing mix 5 surrounding carbon electrode 6. The cell is sealed in the usual manner as indicated at 7. A paper 'disc 8 placed in the bottom of the zinc can serves to insulate the latter from the carbon electrode and the mix.

The outside surflce of the tube 3, before or after it has been cut into lengths, or the inside surface ofzinc cup 4, is coated with the usual paste. Or, if so -called bag-type .cells are used, the paste is poured into t (llv zinc container 4 after the bobbin or the like,

surrounded by a length of paper tubing, has -been positioned therein.

It will be seen that liners formed in. ac-

cordance with the'present invention may be readily manufacturedin large uantities and inexpensively- Their use in ry cells will do away with'the customary and relatively expensive operation 'of forming the paper liner for each cell separately, and the employment of molded paper cups, muslin bags, or the like.

What we claim is:

1. The process of making dry cells which consists in spirally'winding a paper ribbon into a hollow tube with the edges of the spirals overlapping and fastened together by means of flour paste, coating the outside of the tube with 'apaste containing electrolyte, then cutting the tube into suitable lengths. and inserting a length in a zinc container electrode. i

2. The process of making dry cells which comprises forming a tube of absorbent matcrial and securing the edges thereof together,

coating the outside of the tube. with a paste containing electrolyte, then cutting the tube into suitable lengths, inserting a length thercol into a container of a material suitable for use as an electrode, inserting the other electrode within said tube and at least partially filling the space between said other electrode and the tube with depolarizitfg material.

In testimony whereof. We have signed our names to this specification this 20th day of August 1924.

JAMES J..MGCANN. CHARLES G. BIRDS 

